Abstract

The phase diagrams of few-layered nanosystems consisting of dirty superconducting (S) and ferromagnetic (F) metals are investigated within the framework of the modern theory of the proximity effect taking into account the boundary conditions. The F/S tetralayer and pentalayer are shown to have considerably richer physics than the F/S bi- and trilayer (due to the interplay between the 0 and phase superconductivity and the 0 and phase magnetism and nonequivalence of layers) and even the F/S superlattices. It is proven that these systems can have different critical temperatures and fields for different S layers. This predicted decoupled superconductivity is found to manifest itself in its most striking way for F/S tetralayer. It is shown that tetralayer is the most promising candidate for use in superconducting spin nanoelectronics.

Y. P. and M. K. are grateful to the Max-Planck-Institute for the Physics of Complex Systems (Dresden) for providing excellent conditions for fruitful work. Y. P. thanks Prof. Fulde and the participants of his seminar for the productive discussion of the results presented in this paper. This work was supported in part by RFBR (No. 04-02-16761, No. 05-02-16369).